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Soft Starter Overview

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The BSxT soft starters are partly protected, digitally-controlled and programmable units. They are simple to install and are effectively employed in cost sensitive applications driving:

• Transport systems (conveyors, escalators, roller tables etc.) for low inertia loads,
• Pumps,
• Compressors,
• Hydraulic lift pumps,
• Inelastic transmissions (gear trains, high-ratio belt systems etc.), and
• Ventilator fans.

Main features of the line include:

• Starting current and cooling circuit design provides for 55-75 A (starting, per phase), 13-16 HP/10-12 kW loads. The employed 1200 VDC power circuit allows use in up to 3x430 VAC systems.
• Integrated bypass relay minimizes solid state switch losses.
• Electronic protection against:

1. Over/Under-voltage: to protect against supply line problems.
2. Phase sequence and integrity: to protect against dropped phase faults and wrong phase sequence after reconnection to the grid.
3. Noise and line disturbances: protected against the high-voltage spikes and faults of the industrial environment.
4. Internal temperature: to protect against cooling circuit failure, typically caused by a blocked fan or ventilation inlet/outlet.

• Activated after power-up (BSTT models) or via individually powered, isolated, versatile two input user/control interface (BSFT models).
• Available ramp profiles include linear torque, boosted torque, linear voltage (BSTT) and sine voltage (BSTT).
• Selection of ramp profile, deceleration (BSFT models), starting value and duration by DIP switch.
• Galvanically isolated bit outputs "Ready" (BSFT) or "Motoring" (BSTT).
• Small 24 VDC power supply to power a local sensor or other automation device.
• Installation-friendly, robust, space-saving "bookcase" style enclosure.
• Self powered from the 3x400 VAC line.

The individual model characteristics are summarized in the following table:

Other soft starter products of interest:

• The NSFT soft starter is a fully protected unit addressing standard starting applications.
• The iSFT intelligent soft starter controller is recommended for more complex and demanding soft starting applications.
• The solid state relay analog controller can be used to start a single phase motor load.